My husband & I are in our sixties, and we would like to travel by train to Yellowstone Nat. Park. We don't know the best way to travel, where to stay or the best time of year to go. We have only traveled Michigan by car. Any good advice out there?

My husband and I would love to see the mountains and some wild life and stay in a cabin type setting . We are celebrating our 5th aniversary and would like something rustic but romantic! do you have any suggestions in Montana??